(CNN) — A 6-year-old boy was found dead in the frigid waters of Oregon’s Yaquina Bay after his mother told police she threw him off a bridge Monday evening, authorities said.

The body of London McCabe was found in the water about a mile from the Yaquina Bay Bridge about 10:20 p.m., roughly four hours after his mother called 911 to say she’d thrown him from the span, Newport police said.